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Categorizing weight growth of infants born before 32 weeks' gestation using the 2023 postnatal growth charts for

Fu-Sheng Chou1,2,3,4, Hung-Wen Yeh5,6, Crystal Hsueh7

  • 1Southern California Permanente Medical Group, Pasadena, CA, USA. Fu-Sheng.X.Chou@kp.org.

Journal of Perinatology : Official Journal of the California Perinatal Association
|August 12, 2025
PubMed

Insights

This study categorizes infant growth using new charts, finding both slow and fast weight gain in preterm infants are linked to health issues like bronchopulmonary dysplasia.

Area of Science:

  • Neonatalogy
  • Pediatric Growth Monitoring
  • Infant Health Outcomes

Background:

  • Premature infants (born before 32 weeks gestation) require precise growth monitoring.
  • Existing growth charts may not fully capture the nuances of growth in this vulnerable population.
  • Understanding growth patterns is crucial for identifying potential health risks.

Purpose of the Study:

  • To establish distinct weight growth categories for preterm infants.
  • To correlate these growth categories with the incidence of specific morbidities.
  • To introduce an alternative method for assessing infant growth using updated charts.

Main Methods:

  • A retrospective study utilizing the 2023 Postnatal Growth Charts for Preterm Infants.
  • Weight growth was categorized by correlating mean growth velocity (GV) with growth trajectory z-score changes (ΔGTZ).
  • Associations between categorized weight growth and infant morbidities were analyzed.

Main Results:

  • Three growth categories were defined: slower (ΔGTZ < -0.1), in-parallel (-0.1 to 0.3), and faster (ΔGTZ > 0.3).
  • Both slower and faster growth patterns were significantly associated with bronchopulmonary dysplasia.
  • Slower growth was uniquely associated with retinopathy of prematurity.

Conclusions:

  • The 2023 Postnatal Growth Charts for Preterm Infants offer a novel approach to categorizing infant weight growth.
  • This categorization method aids in identifying preterm infants at higher risk for specific morbidities.
  • The findings highlight the complex relationship between growth trajectories and health outcomes in extremely preterm infants.
Abstract

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